This is a follow up of problem
Given the position of only one player's chess pieces(some of them) on the chessboard, figure out whether castling is valid or not.
Determine if a Given Number is a Triangle Number
Make one big string out of two smaller strings
Change the sign of even index entries of the reversed vector
Colon operator of two vectors
Sieve of Eratosthenes - 02
find subscripts from linear index
Take it out
An n-sided regular polygon is drawn within a circle whose radius is 'r', what will be the area of the polygon?
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